Synthesis of Modifiers in the System Cao-Sio2-H2O and their Influence on the Non-Autoclave Silicate Materials’ Properties Using Aluminosilicate Binder

2020 ◽  
Vol 1011 ◽  
pp. 144-150
Author(s):  
Aleksandr Volodchenko
Keyword(s):  
Building Materials ◽  
Water Resistance ◽  
Pore Space ◽  
Crystalline Substance ◽  
Materials Properties ◽  
Clay Rocks ◽  
Increased Strength ◽  
Cementing Material ◽  
Crystallization Degree ◽  
Silicate Materials

Improving the hydration hardening building materials’ operational properties is possible due to the stable macro-, micro-and nanostructures’ creation by the cementing material crystalline aggregate directed modification, which can be achieved through the use of various additives acting as crystallization centers. In the course of the studies, the synthesized modifier effect nature represented by the system was revealed CaO-SiO2-H2O (CSH) on the properties of non-autoclave silicate materials using aluminosilicate binder of various compositions. It has been established that the use of an aluminosilicate binder together with the addition of a CSH modifier increases the presence of a crystalline phase at all stages of hardening, as well as intensifies the synthesis of low-basic calcium hydro silicates with a higher crystallization degree in the system CaO-SiO2(Al2O3)-H2O represented by lime and clay rocks. This contributes to the micro-reinforced crystalline framework formation of the neoplasms with increased strength. Due to this, the pore space decreases and the amount of synthesized crystalline substance increases, which helps to increase the water resistance of the samples in all compositions. The samples using an aluminosilicate binder and the addition of a CSH modifier achieve maximum strength with a CaO content of not more than 10 wt. % The optimal CSH modifier addition is up to 1.5 wt. %, with 7 wt. %, CaO content in a mixture increase in strength is up to 6%.

scholarly journals WALL SILICATE MATERIALS OF NON-AUTOCLAVE HARDENING WITH THE USE OF SILICA RAW MATERIALS AND ALUMINOSILICATE BINDING BASED ON NON-CONVENTIONAL CLAY ROCKS

2019 ◽  
pp. 25-34
Author(s):  
А. Володченко ◽  
A. Volodchenko
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
High Energy ◽  
Structural Features ◽  
Average Density ◽  
High Pressure And Temperature ◽  
Production Technologies ◽  
Clay Rocks ◽  
Microstructure Of The Material ◽  
Silicate Materials

Among the used building materials, structural autoclave silicate products occupy one of the leading places. The traditional technology of silicate materials uses autoclave processing of products, the main disadvantage of which is the high energy intensity. In order to create non-autoclave silicate composites based on conventional siliceous raw materials, it is proposed to use a special aluminosilicate binder based on clay rocks of the incomplete stage of mineral formation of a certain genesis and quicklime. The strength of silicate materials is growing as a result of the neoplasm process. They are synthesized in the chemical reaction of quicklime with components of clay rocks when using high pressure and temperature modes in an autoclave, and when steaming with temperatures up to 100 °C. The high specific surface of the aluminosilicate binder provides an increase in the packing density of the material. Due to the structural features of the CaO-SiO2 (Al2O3)-H2O system based on unconventional clay rocks, the process of formation of the microstructure of the material, which continues and after hydrothermal treatment of the products, gives the material hydraulic properties. The proposed binders and their production technologies can be implemented in small and medium-sized businesses, which will allow to obtain competitive non-autoclave silicate materials with a compressive strength of up to 25 MPa and an average density of 1850 kg/m3.

scholarly journals INFLUENCE OF ARTIFICIAL CALCIUM HYDROSILICATES ON THE HARDENING PROCESSES AND PROPERTIES OF NON-AUTOCLAVE SILICATE MATERIALS BASED ON UNCONVENTIONAL ALUMINOSILICATE RAW MATERIALS

2020 ◽  
Vol 3 (2) ◽  
pp. 19-28 ◽  
Author(s):  
A. Volodchenko
Keyword(s):  
Structure Formation ◽  
Building Materials ◽  
Raw Materials ◽  
Strength Increase ◽  
Isothermal Exposure ◽  
Moisture Treatment ◽  
Calcium Hydrosilicates ◽  
Clay Rocks ◽  
Heat And Moisture ◽  
Silicate Materials

one of the possible ways to improve the properties of building materials is to modify the processes of structure formation, which can be realized through the use of crystalline primers. In this regard, it is urgent to study the effect of artificial calcium hydrosilicates on hardening processes, as well as the properties of non-autoclave silicate materials based on non-traditional aluminosilicate raw materials. Studies have shown that the addition of artificial calcium hydrosilicates (CSH) in an amount of 1-1.5 wt. %, when the content in the mixture of CaO is less than 10 wt. %, effectively increases the strength parameters of products at all stages of heat and moisture treatment from 8 to 16%. The most intense increase in strength is observed during the heat-moisture treatment (TBO) from 3 to 6 hours and is at least 13%, while in samples without the addition of artificial calcium hydrosilicates, the strength increase is 6%. The addition of artificial calcium hydrosilicates intensifies the processes of structure formation, which ensures an increase in crystalline matter, and, due to the fibrous structure, acts as a fiber, which contributes to the nano-reinforcement of the cementing substance formed from neoplasms in the CaO-SiO2(Al2O3)-H2O system based on clay rocks and calcium oxide. Due to the accelerated set of strength, it is possible to reduce the duration of isothermal exposure while maintaining the necessary performance characteristics.

Investigation of the Effect of Combined Binder Based on Portland Cement and Lime on the Properties of Non-Autoclave Silicate Materials Modified with Synthetic Crystalline Filler

2021 ◽  
Vol 1043 ◽  
pp. 127-132
Author(s):  
Aleksandr Volodchenko
Keyword(s):  
Portland Cement ◽  
Building Materials ◽  
Raw Materials ◽  
Mineral Formation ◽  
Hardening Process ◽  
High Temperature And Pressure ◽  
Reduced Parameters ◽  
Temperature And Pressure ◽  
Clay Rocks ◽  
Silicate Materials

Among the wide variety of currently used wall building materials and products, it is possible to single out the autoclave-hardened silicate products. To obtain silicate materials of autoclave hardening, lime-silica binders are mainly used. The hardening process of such a binder is carried out in an environment of water vapor at high temperature and pressure. It is relevant to use a certain type of silicate materials in the technology with raw materials that provide hardening with reduced parameters of hydrothermal synthesis, which will make it possible to obtain wall silicate materials in non-autoclave conditions. This can be done through the use of clay rocks of the mineral formation unfinished stage. In the course of the research, the effect of a combined binder based on Portland cement and lime on the properties of non-autoclave silicate materials modified with a synthetic crystalline filler was studied. It has been established that the addition of a synthetic crystalline filler represented by artificial calcium hydro-silicates makes it possible to increase the presence of a crystalline phase formed due to the clinker minerals hydration in the early stages of hardening, and, as a consequence, to increase the operational properties of the resulting composites. The addition of lime to the raw mixture will additionally compensate for the lack of calcium ions during the entire hardening process of non-autoclave silicate composites based on aluminosilicate raw materials and Portland cement.

Concretes with Unique Properties for Special Building Structures

2019 ◽  
Vol 945 ◽  
pp. 64-69 ◽  
Author(s):  
V. Solovyova ◽  
D. Solovyov ◽  
I. Stepanova
Keyword(s):  
Building Materials ◽  
Water Resistance ◽  
High Efficiency ◽  
Silica Sol ◽  
Building Structures ◽  
High Rise ◽  
Concrete Properties ◽  
Complex Additive ◽  
Potassium Nitrite ◽  
Thin Walled

The paper presents new results in the building materials area. One of the solutions of the thin-walled elements obtaining can be achieved due to new additive using. The main purpose of the paper was improvement concrete properties for thin-walled constructive elements. The experimental and standard methods have been used and new complex additive for concrete. The research shows that a comprehensive additive consisting of aqueous solution of polycarboxilate polymer, silica sol and potassium nitrite is effective and makes it possible to produce high-efficiency concrete with unique properties: higher compression strength, higher crack resistance, frost resistance, water resistance, abrasion resistance. The study shows that the concrete is chemical resistant. Modified concrete can be recommended for manufacturing critical concrete structures of special purpose, for example high-rise constriction.

Pressed Composites Based on Gypsum and Magnesia Binders Modified with Secondary Resources

2020 ◽  
Vol 1011 ◽  
pp. 52-58
Author(s):  
A. Kaklyugin ◽  
Nonna Stupen ◽  
Lubov Kastornykh ◽  
Viktor Kovalenko
Keyword(s):  
Power Plants ◽  
Building Materials ◽  
Water Resistance ◽  
Calcium Phosphates ◽  
Thermal Power ◽  
Building Envelope ◽  
Secondary Resources ◽  
Combined Structure ◽  
Fine Crystalline Structure ◽  
Artificial Stone

The results of the studies aimed at increasing the water resistance of the pressed building materials based on gypsum and magnesia binders due to their modification with active dispersed fillers from secondary resources are presented. The gypsum binder modification was carried out by the joint introduction of carbonate-containing sludge from it into the chemical treatment of thermal power plants and monoammonium phosphate, and of magnesia cement - silica fume and finely ground burnt mines. Physical and mechanical characteristics of the materials’ control samples were determined according to the standards and generally accepted methods. The increase in water resistance of the pressed modified composites was evaluated by changing the softening coefficient. It is shown that when using gypsum binders, an increase in the water resistance of products based on them can be achieved by changing the structure formation of the pressed material and the formation on the elements’ surface of its fine-crystalline structure of the sparingly soluble calcium phosphates’ screening protective films. The increase in water resistance of pressed products made of modified magnesia binders is explained by the appearance of insoluble hydro silicates, hydro aluminates and hydro aluminosilicates of magnesium, in the structure of the hardened artificial stone as well as the formation of a complex combined structure containing coagulation, condensation and crystallization phases. The technical characteristics of the materials obtained are sufficient for their use, in particular, in the building envelope. The possibility of replacing a significant amount of binders with secondary resources has been identified. This allows not only to increase the water resistance of the pressed products on the basis of the proposed modified binders, but also to reduce their cost, as well as free up the land allocated for dumps.

Efficient Autoclaved Silicate Concretes with the Use of Steelmaking Slag

2018 ◽  
Vol 284 ◽  
pp. 956-962 ◽  
Author(s):  
Yu.L. Starostina ◽  
O.A. Plotnikova
Keyword(s):  
Calcium Silicate ◽  
Control Sample ◽  
Steelmaking Slag ◽  
Dry Milling ◽  
Disposal Area ◽  
Twofold Increase ◽  
Steelmaking Slags ◽  
Calcium Silicate Hydrates ◽  
Crystallization Degree ◽  
Silicate Materials

The article presents the findings of the research concerning the usage of slowly cooled crystallized steelmaking slags, taken from slag disposal area, in the raw mix for autoclaved silicate materials. By means of dry milling and with the use of this slag the slag-containing binders of various compositions and basicity were prepared. The application of steelmaking slags in the raw mix allows intensifying the process of new formations synthesis and increasing the amount and crystallization degree of low-basic calcium silicate hydrates of the tobermorite group, which provides more than twofold increase of strength characteristics of the obtained materials as compared to the control sample.

Study of Material Characteristics about Lower Cambrian Black Shale in ZhiJin-KaiYang-XiFeng, Guizhou

2012 ◽  
Vol 170-173 ◽  
pp. 1162-1166
Author(s):  
Jie Zhang ◽  
En Lin Yang ◽  
Yong Ning Di ◽  
Fei Xie ◽  
Guo Feng Yang
Keyword(s):  
Carbon Black ◽  
Black Shale ◽  
Building Materials ◽  
Deep Processing ◽  
High Carbon ◽  
Technical Process ◽  
Black Clay ◽  
Metallic Mineral ◽  
Black Rock Series ◽  
Clay Rocks

The high cambrian black rock series of clay under Zhijin, Kaiyang, Xifeng and other areas of Guizhou , are high carbon black shale - clay rocks characterized by containing illite ores[1]. After deep processing, it will be served as illite ores belonging to a useful clay minerals, and the main directions of development and application include filler, new building materials and ceramics. After the activation, potassium can be extracted from illite that is often rich in potassium which can be prepared for potash fertilizer. Carrying out the study of mineral material science of high carbon black clay mineral rock , the aim is developing and using this type of non-metallic mineral. Based on this study, recoverying useful metal elements by exploring the reasonable technical process will be significant to enhance the comprehensive value of the type of deposit and improve its economic efficiency.

Experimental Study on Frothing Technics with Mixed Polyurethane Materials

2008 ◽  
Vol 400-402 ◽  
pp. 151-156
Author(s):  
Yi Gao ◽  
Zhuo Bin Wei
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Impact Load ◽  
Pore Space ◽  
Loading Test ◽  
Materials Properties ◽  
Initial Strength ◽  
Polyurethane Composite ◽  
Strength Based ◽  
Backfill Materials

Frothing technics with mixed polyurethane materials have been widely used in the field of civil engineering. Polyurethane has many properties, such as frothing quickly, stronger viscidity and better elasticity. Having been frothed and vulcanized, polyurethane with other hard granules can form a new kind of backfill materials which have the higher initial strength. Based on the properties of polyurethane above, the frothing technic of polyurethane materials can be applied to consolidation and backfill of concrete and roadbed structure. In this paper, on the base of the experimental research about the materials’ properties, a test simulating an actual consolidation of subsoil was processed. The stable backfill substance used as base of pavement can be formed quickly by frothing of polyurethane in the pore space of gravels. The surface of pavement can be made from gravels and some certain polyurethane. It took 2 hours to backfill the base and to make the surface. Immediately, the loading test including static and impact load was taken. The result of the test indicated that the mechanical properties of surface and base made up of polyurethane composite materials can satisfy certain standards and specifications.

Research on Preparation and Properties of New Type Desulfurization Gypsum Block

2014 ◽  
Vol 540 ◽  
pp. 217-220
Author(s):  
Chuan Wei Du ◽  
Ying Lv ◽  
Guo Zhong Li
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Water Resistance ◽  
Experimental Results ◽  
New Type ◽  
Cementing Material ◽  
The Impact

Desulfurization building gypsum was used as the main gelled material and fly ash was used as filler to prepare the new type desulfurization gypsum block. the mechanical properties of the new type desulfurization gypsum block was improved by adding compound excitation agent into the desulphurization gypsum-fly ash cementing material to stimulate its activity. The water resistant performance of the new type desulfurization gypsum block was improved through adding wax-alcohol compound waterproofing agent into it. Experimental results show that when the filling amount of fly ash was 20%(the quality of desulfurization gypsum), the impact on the strength of gypsum was minimal; when the dosage of compound excitation agent was 1.75%, the excitation effect of desulphurization gypsum-fly ash cementing material was best; when the dosage of wax-alcohol compound waterproofing agent was 0.4%, the water resistance of new desulfurization gypsum block was optimal.

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